Done in two steps: first, make the list of installers have a good order
(determined by package, then OS type, then cpu, etc); make the JS code
that re-sorts the entries move only the desired options to the top but
otherwise use the original order (which is the previous thing).
For example, instead of "Linux - Fedora 7 (x86_64)", use "Linux x86_64
(Fedora 7)". Hopefully, this will make it clearer that it's often fine
to use some linux installer on a different platform than the one it was
made on. (For example, some people wanted an AMD64 build for Ubuntu,
and eventually it turned out that the x86_64 build on Fedora worked
fine.)
This is even more relevant now since the C part is much less platform
dependent in the linux distro sense.
